linux-kernel - Re: [PATCH 7/9] s390/block/dcssblk: add error handling support for add

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Message-ID: <YT+B+vCUcpZEq8hM@bombadil.infradead.org>
Date:   Mon, 13 Sep 2021 09:53:14 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Gerald Schaefer <gerald.schaefer@...ux.ibm.com>
Cc:     Heiko Carstens <hca@...ux.ibm.com>, axboe@...nel.dk,
        gregkh@...uxfoundation.org, chaitanya.kulkarni@....com,
        atulgopinathan@...il.com, hare@...e.de, maximlevitsky@...il.com,
        oakad@...oo.com, ulf.hansson@...aro.org, colin.king@...onical.com,
        shubhankarvk@...il.com, baijiaju1990@...il.com, trix@...hat.com,
        dongsheng.yang@...ystack.cn, ceph-devel@...r.kernel.org,
        miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        sth@...ux.ibm.com, hoeppner@...ux.ibm.com, gor@...ux.ibm.com,
        borntraeger@...ibm.com, oberpar@...ux.ibm.com, tj@...nel.org,
        linux-s390@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-mmc@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/9] s390/block/dcssblk: add error handling support for
 add_disk()

On Mon, Sep 06, 2021 at 01:43:46PM +0200, Gerald Schaefer wrote:
> On Fri, 3 Sep 2021 18:46:26 -0700
> Luis Chamberlain <mcgrof@...nel.org> wrote:
> 
> > On Fri, Sep 03, 2021 at 04:08:48PM +0200, Heiko Carstens wrote:
> > > On Thu, Sep 02, 2021 at 10:41:03AM -0700, Luis Chamberlain wrote:
> > > > We never checked for errors on add_disk() as this function
> > > > returned void. Now that this is fixed, use the shiny new
> > > > error handling.
> > > > 
> > > > Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> > > > ---
> > > >  drivers/s390/block/dcssblk.c | 4 +++-
> > > >  1 file changed, 3 insertions(+), 1 deletion(-)
> > > > 
> > > > diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
> > > > index 5be3d1c39a78..b0fd5009a12e 100644
> > > > --- a/drivers/s390/block/dcssblk.c
> > > > +++ b/drivers/s390/block/dcssblk.c
> > > > @@ -696,7 +696,9 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char
> > > >  	}
> > > >  
> > > >  	get_device(&dev_info->dev);
> > > > -	device_add_disk(&dev_info->dev, dev_info->gd, NULL);
> > > > +	rc = device_add_disk(&dev_info->dev, dev_info->gd, NULL);
> > > > +	if (rc)
> > > > +		goto put_dev;
> > > 
> > > This looks not correct to me. We seem to have now in case of an error:
> > > 
> > > - reference count imbalance (= memory leak)
> > > - dax cleanup is missing
> > 
> > Care to provide an alternative?
> 
> See patch below:

Thanks! Will you queue this up on your end or do would you
prefer for me to roll this into my tree and eventually resend
with the rest?

  Luis